Library · Materials, chemistry & fabrication
What Metal Oxide Material Engineering got wrong, from 32 theses
Summary written by a model from the records below: The records document diverse engineering failures in metal oxide materials across photocatalytic, electrocatalytic, energy storage, and device applications. Material performance was commonly undermined by interfacial transport barriers, excessive loading, thermal or reductive phase transformations, and operational degradation. These records come from graduate theses, 2021 to 2026, each labeled with its degree where the repository states it, and each links to its thesis. They were extracted by language models reading the full text, so treat each as a lead to read, not a verdict.
Plus 9 problems the authors left open, listed at the end.
Failure modes, by theses reporting them
Select a mode to jump to its records.
Interfacial defects and band misalignment introduce severe charge transport barriers
Integrating metal oxide transport layers or surface dopants frequently creates unpassivated interface defects, unfavorable band alignments, and high charge transfer resistance. These interfacial deficiencies lead to severe device hysteresis, carrier mobility degradation, and complete electrical shorting.
Tried and failed
transition metal surface termination doping applied to perovskite oxide oxygen reduction catalysts. Outcome: worse than baseline. Reason: terminating with B-site cations or inert metals decreased catalytic activity and increased polarization resistance
Understanding And Predicting The Chemical Properties Of Complex Oxides Using First-Principles Methods · Penn · PhD
Tried and failed
conducting polymer photosensitization of metal oxide photocatalysts applied to visible light photocatalytic degradation. Outcome: no signal. Reason: incompatible HOMO-LUMO energy band alignment with the titanium dioxide conduction band
Electrospun Electroactive Polymer Nanocomposites for Water Purification · Texas State University · PhD
Tried and failed
peroxide surface treatment for defect passivation applied to metal oxide electron transport layers. Outcome: worse than baseline. Reason: failed to eliminate hysteresis as effectively as alternative surfactant or halide dopants
Scalable Perovskite Thin-Film Photovoltaics · MIT · PhD
Tried and failed
mesoporous metal oxide hole transport layer integration applied to tin-based perovskite solar cells. Reason: devices suffered complete electrical shorting due to pinholes and reduced film grain size
Fabrication and characterization of lead-free and lead based perovskite solar cells · Imperial · PhD
Tried and failed
nickel oxide hole transport layer substitution applied to tin-based perovskite solar cells. Outcome: worse than baseline. Reason: poor interfacial contact and interfacial oxidation causing severe S-shaped J-V curves
Fabrication and characterization of lead-free and lead based perovskite solar cells · Imperial · PhD
Lost to a baseline
Bare MTO without PEDOT:PSS in p-i-n perovskite solar cells achieved only 0.5% PCE and 30% FF compared to 6.4% PCE with PEDOT:PSS due to oxide interface defects/insulating nature.
Considered and rejected
Considered and rejected: Rejected transition metal oxides (MoO3, V2O5) surface-transfer doping due to drastic carrier mobility degradation at high carrier densities and integration difficulty
Diamond on GaN integration for power semiconductor devices with efficient thermal management · EPFL · PhD
Tried and failed
direct covalent polymer grafting via esterification applied to metal oxide nanoparticle electrode slurries. Outcome: worse than baseline. Reason: caused severe capacity fade, poor rate capability, and high charge transfer resistance
Understanding interfacial phenomena for the creation of next-generation high-capacity battery electrodes · Georgia Tech · PhD
Excessive material loading and over-deposition cause pore clogging and agglomeration
Applying excessive amounts of metal oxides or prolonged deposition cycles causes particle clustering, pore blockage, and elevated electrical resistance. As a result, the modified materials suffer from reduced specific capacitance, loss of accessible active surface area, and optical losses.
Considered and rejected
Considered and rejected: Rejected high titanium oxide hydrate content (>80 vol%) hybrid formulations due to poor thin-film processability and premature TiO2 nanoparticle formation/aggregation leading to optical loss.
Elucidating exciton-polaritons in organic and two-dimensional metal halide semiconductors · Georgia Tech · PhD
Tried and failed
high mass loading of electrodeposited metal oxide applied to porous carbon supercapacitor electrodes. Outcome: unstable. Reason: active material dissolution and structural degradation during cycling
Electrochemical studies of the applications of novel carbon-based materials · Oxford · PhD
Tried and failed
prolonged electrodeposition of metal oxide applied to porous carbon supercapacitor electrodes. Outcome: worse than baseline. Reason: excessive active material loading increased electrical resistance, reducing specific capacitance at high scan rates
Electrochemical studies of the applications of novel carbon-based materials · Oxford · PhD
Tried and failed
high metal-oxide nanoparticle loading in carbon nanocomposite inks applied to printed microsupercapacitor electrodes. Outcome: worse than baseline. Reason: nanoparticle clustering severely degraded electrochemical capacitance compared to additive-free electrodes
Additive Fabrication of Microsupercapacitors · EPFL · PhD
Tried and failed
excessive cyclic electrodeposition of metal oxide coatings applied to pseudocapacitive carbon nanotube electrodes. Outcome: worse than baseline. Reason: increasing deposition cycles degraded capacitive performance, likely due to pore blockage or excessive film resistance
Design, Fabrication, and Characterization of Nanostructured Pseudocapacitive Coatings on Vertically Aligned Carbon Nanotube Electrodes for High Performance 3D Microsupercapacitors · Georgia Tech · PhD
Tried and failed
excessive metal oxide deposition on porous sorbents applied to adsorptive water contaminant removal. Outcome: worse than baseline. Reason: overloading blocked adsorbent pores and reduced accessible active surface area, decreasing overall adsorption capacity
Treatment of Aqueous Arsenic Using Chemically and Electrochemically Modified Biomaterials · Saskatchewan · PhD
Tried and failed
increasing metal dopant loading in zeolite catalysts applied to methane catalytic oxidation. Outcome: worse than baseline. Reason: excessive metal loading formed inactive oxide clusters instead of active isolated sites, lowering turnover frequency
Design and Engineering of Carbon Fixing Material Systems · MIT · PhD
Unfavorable reduction and ineffective reductive regeneration degrade catalytic activity
Subjecting metal oxide catalysts to reductive operating conditions or reductive regeneration causes undesired phase transitions into inactive hydroxides or metallic states that promote coking. In other settings, reduction cycles fail to eliminate carbonaceous deposits, fail to reach the necessary reduction temperatures, or alter reaction pathways away from desired products.
Tried and failed
transition metal doping in perovskite catalyst applied to solid oxide fuel cell anodes. Outcome: unstable. Reason: Dopants reduced to metallic phase under hydrocarbons, causing rapid coking and cell degradation
Development of Novel Electrode and Catalyst Materials for Solid Oxide Electrochemical Cells · Georgia Tech · PhD
Tried and failed
cathodic reductive potential regeneration applied to deactivated metal oxide electrocatalysts. Outcome: worse than baseline. Reason: negative potential caused irreversible phase transformation from active oxide to inactive hydroxide
Novel electrode fabrication and reactor design for electrocatalytic nitrate and nitrite reduction in drinking water treatment · UT Austin · PhD
Tried and failed
reductive catalyst regeneration applied to deactivated supported metal oxide catalysts. Reason: reduction cycles alone cannot remove carbonaceous deposits without oxidative treatment
Surface Reactions of Biomass Derived Oxygenates on Lewis Acidic Metal Oxides · Georgia Tech · PhD
Tried and failed
pre-reduction of supported metal oxide catalyst applied to water-gas-shift catalytic activity. Outcome: worse than baseline. Reason: reduction lowered catalytic activity compared to the unreduced state
INVESTIGATION OF THIN-FILM CERIUM-BASED OXIDES AND SINGLE ATOM CATALYSTS PREPARED BY ATOMIC LAYER DEPOSITION · Penn · PhD
Operational degradation and phase breakdown occur under continuous cycling or illumination
Prolonged exposure to operating conditions such as photochemical illumination or broad potential cycling triggers microcracking, active material dissolution, and phase segregation. These instabilities lead to rapid capacity fading, detachment of photoactive species, and irreversible degradation into inactive binary oxide phases.
Tried and failed
tethering molecular photooxidants to metal oxide catalysts applied to photoelectrochemical water oxidation. Outcome: unstable. Reason: dye molecules detached under operating conditions and underwent oxidative degradation rather than driving catalysis
Development and Study of Heterogeneous Earth-Abundant Oxygen Evolving Catalysts for Use in Diverse Electrolyte Environments · Harvard · PhD
Tried and failed
photocatalytic water splitting using mixed-metal oxide applied to strontium copper oxide photocatalysts. Outcome: unstable. Reason: the material degraded into binary copper oxides under operational photocatalytic conditions
A COLLABORATIVE APPROACH TO MATERIALS DISCOVERY FOR WATER SPLITTING PHOTOCATALYSTS AND LITHIUM SULFUR REDOX. · Cornell · PhD
Tried and failed
single-layer titanium dioxide electron transport layer applied to planar perovskite solar cells. Outcome: unstable. Reason: severe light- and UV-induced degradation caused by titanium dioxide photocatalytic and interfacial instability
Composition and Interface Engineering of High Performing Perovskite Solar Cells · EPFL · PhD
Tried and failed
large range potential cycling applied to perovskite thin-film oxide electrodes. Outcome: unstable. Reason: induced microcracking or delamination, causing irreversible impedance changes
Tried and failed
omitting dopants in high-entropy transition metal oxides applied to battery anode materials. Outcome: unstable. Reason: loss of specific dopant cations caused rapid capacity degradation during high-rate extended cycling
Development of niobium-based oxide anodes with the Wadsley-Roth shear structure for fast-charging and durable lithium-ion batteries · Georgia Tech · PhD
Tried and failed
aliovalent cation solid solution doping applied to oxide thin-film battery electrodes. Outcome: unstable. Reason: severe capacity fading and poor cycling stability despite high initial discharge capacity
High-temperature thermal processing causes phase transformation and dopant volatilization
Calcination, sintering, or prolonged pyrolysis at high temperatures leads to severe structural degradation, unwanted phase transformations, and dopant volatilization. Furthermore, thermal and hydrothermal aging causes isolated active transition metal centers to agglomerate into inactive oxide clusters.
Tried and failed
high-temperature calcination of catalyst precursor applied to supported metal oxide photocatalyst composite. Outcome: worse than baseline. Reason: phase transformation into oxide decreased photocatalytic degradation efficiency and degraded catalytic reusability over cycles
Porous Heterogeneous Hierarchical Materials for Environmental Applications · Cornell · PhD
Tried and failed
High-temperature chemical anion doping applied to oxide nanoparticle electrocatalysts. Outcome: worse than baseline. Reason: Severe structural degradation of nanoparticles led to reduced oxygen evolution reaction activity
Polymer-Ligated Nanocrystals with Tunable Dimensions, Compositions, and Architectures · Georgia Tech · PhD
Tried and failed
transition metal oxide doping via air sintering applied to zirconia-based ceramic solid solutions. Outcome: unstable. Reason: Severe dopant volatilization above 1273 K with low solubility and preferential partitioning into secondary phases
Towards Crack-Resistant Polycrystalline Zirconia Shape-Memory Ceramics with Low Hysteresis · MIT · PhD
Tried and failed
extended pyrolysis duration for carbon-metal oxide composites applied to battery cathode materials. Outcome: worse than baseline. Reason: prolonged thermal treatment degraded structural stability leading to rapid capacity fading after initial cycling
SUPPRESSING PHYSICOCHEMICAL INSTABILITIES AT ELECTROCHEMICAL INTERFACES——TOWARDS SUSTAINABLE BATTERY ELECTRODES · Cornell · PhD
Tried and failed
hydrothermal aging of transition metal zeolite catalysts applied to selective catalytic reduction of nitrogen oxides. Reason: active metal species irreversibly agglomerate into inactive oxide clusters, causing nonselective oxidation
The simultaneous Selective Catalytic Reduction of N2O and NO over Fe-exchanged zeolites · EPFL · PhD
Competitive adsorption and active site blockage diminish catalytic and sorptive performance
Background ions in complex feedstocks and metallic promoters can competitively bind to active surface sites or suppress oxygen vacancies on oxide supports. Without proper regeneration or surface control, these interfering species reduce reactant adsorption and significantly lower catalytic conversion.
Tried and failed
photocatalytic pollutant oxidation using mixed-metal oxide catalysts applied to high-salinity wastewater treatment. Outcome: too slow. Reason: competitive adsorption of background salts onto catalyst active sites inhibited reactant binding
Engineered Sn doped TiO2 bifunctional catalyst for improved hetero-photocatalytic oxidation of arsenite in water · Imperial · PhD
Tried and failed
Noble metal nanoparticle decoration on defective metal oxides applied to electrocatalytic oxygen evolution reaction. Outcome: worse than baseline. Reason: High surface oxygen vacancy coverage suppresses electrocatalytic activity upon gold nanoparticle introduction
Structural design and electronic modification of 3d transition metal compounds and their applications in electrocatalysis · Imperial · PhD
Considered and rejected
Considered and rejected: Rejected non-acidified regeneration cycles for iron oxyhydroxide because electrostatically bound Na+ and Ca2+ blocked active sites and caused rapid loss of adsorption capacity.
Enhanced microalgae based treatment methods to remove pharmaceutical and personal care products (PPCPs) and phosphorus from wastewater and using biomass to produce biogas · Iowa State · PhD
Tried and failed
indium promoter addition to supported copper catalysts applied to heterogeneous carbon dioxide hydrogenation. Outcome: worse than baseline. Reason: Decreased active metal dispersion and reduced concentration of reducible oxide support oxygen vacancies
Left open by the authors
Problems the authors named and did not get to.
Left open
Synthesize and integrate bimetallic or oxide-derived cocatalysts onto Cu2O/Ga2O3/TiO2 photocathodes to extend operating stability beyond 44 hours. Blocker: Requires wet-lab materials synthesis, atomic layer deposition, electrodeposition equipment, and photoelectrochemical testing apparatus.
Surface and Electrolyte Engineering on Semiconductor Electrodes for solar-assisted CO2 Reduction · EPFL · PhD
Left open
Investigate co-doping strategies in spray-pyrolysis-deposited iron oxide thin films to enhance photocatalytic activity. Blocker: Requires a wet chemistry and material synthesis lab with spray pyrolysis apparatus to synthesize and test thin films.
Elaboration and optimization of Iron Oxide thin films deposited via spray pyrolysis. Applications in water treatment · University of El Oued · Doctorate
Left open
Synthesize dilute PdAu RCT catalysts on alternative metal oxide frameworks and evaluate support effects on catalytic oxidation performance. Blocker: Requires wet-lab chemical synthesis of alternative metal oxide supports and flow-reactor catalyst testing apparatus.
Oxidation Catalysis by Novel Dilute Palladium-in-Gold Nanoparticles Supported on Porous Silica · Harvard · PhD
Left open
Functionalize graphene field-effect transistors with metal oxide nanoparticles, metalloporphyrins, and bio-receptors for gas-phase volatile organic compound sensing. Blocker: Requires a wet chemistry and nanomaterials fabrication laboratory to synthesize functional materials and measure sensor responses.
Graphene-based Biochemical Sensing Array: Materials, System Design and Data Processing · MIT · PhD
Left open
Investigate the relationship between dielectric constant and bimolecular recombination rates across various metal oxide semiconductors. Blocker: Requires experimental transient absorption spectroscopy measurements across multiple metal oxide materials.
Time-resolved spectroscopic studies of SrTiO3 photocatalysts for water splitting · Imperial · PhD
Left open
Design and engineer self-assembled monolayer to transparent conducting oxide covalent bonding to improve perovskite solar cell moisture durability. Blocker: Requires wet lab chemical synthesis and experimental photovoltaic device fabrication and testing
MICROSTRUCTURE MODULATION FOR EFFICIENT CHARGE TRANSPORT IN PEROVSKITE SOLAR CELLS · Cornell · PhD
Left open
Incorporate reduced graphene oxide interlayers or dopants like C60F48 or CuI into AACVD CuSCN perovskite solar cells to decrease series resistance. Blocker: Requires a physical materials synthesis and wet chemistry laboratory with AACVD equipment and solar cell fabrication tools.
Copper(I) thiocyanate deposited via aerosol-assisted chemical vapour deposition for use in perovskite solar cells · Imperial · Doctorate
Left open
Investigate electron-beam induced exsolution and re-oxidation reversibility of exsolved nanoparticles on lanthanum nickel oxide double perovskites. Blocker: Requires transmission electron microscopy (TEM) facilities and physical perovskite samples.
Lanthanum nickel oxide based double perovskites and their exsolution phenomena · Imperial · PhD
Left open
Investigate the long-term health and environmental toxicity of cold-plasma-synthesized zinc oxide nanoparticles using in vitro and in vivo models. Blocker: Requires wet lab, biological assays, and toxicological testing facilities with physical nanoparticle samples.
Study of the Characteristics and Photocatalytic Application of ZnO Nanoparticles Synthesized by Cold Plasma · University of El Oued · Doctorate
Who has worked on this
Authors of the public theses cited on this page, most-cited first.
- Ganghong Min · Imperial · PhD · 2023
Fabrication and characterization of lead-free and lead based perovskite solar cells - Y Wang · Oxford · PhD · 2022
Electrochemical studies of the applications of novel carbon-based materials - Yoojin Ahn · Georgia Tech · PhD · 2026
Development of niobium-based oxide anodes with the Wadsley-Roth shear structure for fast-charging and durable lithium-ion batteries - Drew E. Buzzell · MIT · PhD · 2025
Tailoring Li₄Ti₅O₁₂ Thin Film Carrier Kinetics Through Solid Solution Doping for Battery and Memristor Applications - Yuanze Xu · Cornell · PhD · 2024
MICROSTRUCTURE MODULATION FOR EFFICIENT CHARGE TRANSPORT IN PEROVSKITE SOLAR CELLS - Victoria Quiros Cordero · Georgia Tech · PhD · 2024
Elucidating exciton-polaritons in organic and two-dimensional metal halide semiconductors - Tian Tang · Cornell · PhD · 2024
SUPPRESSING PHYSICOCHEMICAL INSTABILITIES AT ELECTROCHEMICAL INTERFACES——TOWARDS SUSTAINABLE BATTERY ELECTRODES - Daniel James Lundberg · MIT · PhD · 2024
Design and Engineering of Carbon Fixing Material Systems - Kai Shen · Penn · PhD · 2024
INVESTIGATION OF THIN-FILM CERIUM-BASED OXIDES AND SINGLE ATOM CATALYSTS PREPARED BY ATOMIC LAYER DEPOSITION - Filippo Buttignol · EPFL · PhD · 2024
The simultaneous Selective Catalytic Reduction of N2O and NO over Fe-exchanged zeolites - Meng Xia · EPFL · PhD · 2024
Surface and Electrolyte Engineering on Semiconductor Electrodes for solar-assisted CO2 Reduction - MESSAI Ridha · University of El Oued · Doctorate · 2024
Study of the Characteristics and Photocatalytic Application of ZnO Nanoparticles Synthesized by Cold Plasma
Checking a claim in this area?
We can run the same search on any method or claim. If nothing turns up, we will say so, and that proves nothing on its own.